फ़्लैशकार्ड

Articles signal whether a noun refers to a general concept, an unidentified single item, or an item that the listener can identify. The indefinite articles a and an introduce one singular countable noun whose exact identity is not yet shared or important. The definite article the points to an identifiable noun, whether singular, plural, or uncountable. When you discuss plural categories or uncountable substances in general, English leaves out the article entirely.

Could you pass me a clean cloth from the storage bin?